Answer: PRS

AnswerCrossword Clue
PRSPhone's dial letters at "7"
PRSDoubles: Abbr.
PRSQuantities of shoes: Abbr.
PRSSocks, shoes, etc.: Abbr.
PRSBraces: Abbr.
PRSMates: Abbr.
PRSShoes, socks, etc.: Abbr.
PRSCommercial abbreviation.
PRSDuos: Abbr.
PRSGlove units: Abbr.
PRSGloves and hose: Abbr.
PRSPoker holdings: Abbr.
PRSNo. 7 on a phone dial
PRSHamlet and Charles: Abbr.
PRSNatives of San Juan: Abbr.
PRSTwos: Abbr.
PRSGp. in "West Side Story"
PRS7 on a dial
PRS7 on an old phone
PRSOld phone trio
PRSPhone pad letters
PRSTrigram on rotary phones
PRSSeven's phone trio
PRSSeven's former phone trio
PRSLetters near 7, on some old phones
PRSTwos: abbr.
PRSTwosomes: abbr.
PRSDbls.
PRSTrigram on many phones
PRSSock units: abbr.
PRSAsterisk neighbor
PRS7, on the phone
PRSRunners' own bests (abbr.)
PRS7, on many phones
PRS7, on older phones
PRSCouples: Abbr.
PRSLetters on the 7 button on older phones
PRSButton on older phones
PRSCommon string that omits Q
PRSTwosomes (abbr.)